At 1:30 am, observed large black triangular craft flying southbound over Isleta Reservation, NM.As told by witness; Driving southbound at 1:30 am, on I-25 from Albuquerque to Los Lunas, exiting Broadway Blvd. and entering the Isleta Reservation, coming from the underpass the individual observed a corner of a huge triangular shape black craft. (The witness could not see the other ends/corners). It emitted no sound and was hardly detectable because the nightsky was very dark. The craft was travelling not at high rate in the southeast direction toward Mountainair, NM. The mountain range is believed to have multiple underground facilities, for military purposes, or otherwise.((NUFORC Note: Witness indicates that the date of the incident is approximate. PD))((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))